I can understand your frustration but the statement "that many upstream developers of desktop components like the display manager always seem to completely ignore everything which goes beyond single-user or single-machine systems." is wrong, there are bugs though and people working on a local system might not easily hit and notice those...
the bug you are commenting on is closed though, could you open a new one with the issues you noticed?
@Adrian:
I can understand your frustration but the statement "that many upstream developers of desktop components like the display manager always seem to completely ignore everything which goes beyond single-user or single-machine systems." is wrong, there are bugs though and people working on a local system might not easily hit and notice those...
the bug you are commenting on is closed though, could you open a new one with the issues you noticed?